Coil-globule transition of poly(methyl methacrylate) by intrinsic viscosity
JOURNAL OF CHEMICAL PHYSICS, cilt.109, sa.19, ss.8701-8707, 1998 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 109 Sayı: 19
- Basım Tarihi: 1998
- Doi Numarası: 10.1063/1.477536
- Dergi Adı: JOURNAL OF CHEMICAL PHYSICS
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.8701-8707
- Marmara Üniversitesi Adresli: Hayır
Özet
The coil-globule transition for poly(methyl methacrylate) has been studied in the mixed solvent tert-butyl alcohol+water system. Two polymeric samples having molecular weights M-w=2.55 x 10(6) and M-w = 4.73 x 10(6) were used. The contraction and expansion of the molecular chains were determined by viscometric measurements, The results were compared with light scattering data obtained recently for the same system. A smooth and continuous contraction was observed below the theta temperature (41.5 degrees C). The temperature dependence of [eta] can be represented by a master curve in alpha(eta)(3)\tau\M-w(1/2) vs \tau\M-w(1/2) plot, where alpha(eta)(3) = [ eta(T)]/[ eta(theta)] is a viscosity expansion factor and tau =(T - theta)/T is the reduced temperature. A comparison of the observed globular radius with a theory for contracted coil confirmed the coil-globule transition for this system. (C) 1998 American Institute of Physics. [S0021-9606(98)52443-9].